Abstract
An integrated drive arrangement for a wastewater pumping system was designed and modeled to evaluate the energy saving gained from matching motors with Variable Frequency Drive (VFD) and Programmable Logic Controller (PLC). The proposed arrangement utilizes the affinity laws of centrifugal pumps to predict the performance of a pump under different rotational speed conditions. The specific energy (Es) is used as a measure of the cost effectiveness of the proposed pumping system. Results have shown that a reduction of 10% in pump speed can save 30% in energy of maximum speed. The energy saving potential is carried out for a real-life case study, and a conclusion to replace on-off controllers currently used for most wastewater pumping systems is necessary. The total energy saving account for more than 50% when integrated drive system was applied for a combined sewer pump station.
Highlights
Energy consumption of pumping systems dominates the life cycle cost of wastewater pumps
Pumping systems are considered a major consumer of electricity
Many flow control solutions of pumping systems have been reported in the literature
Summary
Energy consumption of pumping systems dominates the life cycle cost of wastewater pumps. It may be as high as (35-40%) of the life cycle cost. Pumping systems are considered a major consumer of electricity. Pump motors receive electrical power (pump power input) and transform it into mechanical work (rotational energy). The rotational energy delivers liquids to higher head (pump power output). Many flow control solutions of pumping systems have been reported in the literature. The purpose of the reported solutions is to ensure pump’s operational reliability and to save energy and operational expenses
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